Anthropic + Mozilla: Opus 4.6 Found 22 Firefox Vulns in Two Weeks

r/singularity·high signal

Anthropic's partnership with Mozilla produced 22 Firefox vulnerabilities in two weeks using Claude Opus 4.6, including 14 high-severity bugs — roughly a fifth of Mozilla's entire 2025 high-severity fix output. This is the strongest empirical evidence yet that frontier models can perform professional-grade security auditing at scale. 751up, 36 comments. Directly validates the "AI security researcher" use case with production-quality results against a real, mature codebase.